【摘要】 研究了多弧离子镀铝对γ-TiAl合金850℃、950℃恒温氧化性能的影响,同时分析讨论了镀铝层的氧化机制。结果表明:多弧离子镀铝后,形成的纯铝涂层均匀致密,无裂纹、孔洞,与基体结合良好。静态空气中,850℃氧化100 h后,形成了连续致密的A12O3膜层及扩散层TiAl3相;950℃氧化100 h后,表面氧化膜由A12O3及少量的TiO2组成,膜层中TiAl2为主要成膜相。多弧离子镀铝有效地提高了γ-TiAl合金高温抗氧化性能。更多还原

【Abstract】 Isothermal oxidation behavior of γ-TiAl alloy,which was aluminized at 850 ℃ and 950 ℃ by multi-arc ion plating(MAIP),were investigated.The oxidation mechanism of Al coatings was also discussed.The results show that the multi-arc ion plating aluminum films are compact and consist of Al,no cracks,holes,but with good binding capacity.They turn to a continuous and dense layer of A12O3 and the diffusion layer TiAl3 after oxidation at 850 ℃ in air for 100 h;after high temperature oxidation at 950 ℃ in static air for 100 h,the surface oxidation film is formed of A12O3 and a little of TiO2,and TiAl2 is mostly phase in the film.The high temperature oxidation resistance of γ-TiAl alloy is improved obviously after multi-arc ion plating aluminum.更多还原